Plastic-block mold



E. J. BENSON.

PLASTIC BLOCK MOLD. APPLICATION FILED NOV. 6. 1920.

Patented Mar. 7, 1

S H E ET 2 SHEETS- Err/est 136725011,

ATTORNEYS WITNESSES E. J. BENSON.

PLASTIC BLOCK MOLD.

4 APPLICATION FILED NOY. 6,1920.

1,408,685 Patent d Mar- 7, 1922.

2 SHEETS-SHEET 2.

Q L: i

- N N R w 3 3% N WITNESSEB G Lr INVENTOR ,1 .Ernest .Jfienson, jzfma" Br A TTORNEYS block 7 through the body of the block and grooves :one which is capable of being readily disumrso sTA'ras manner Jenn Bnnson,

rATENT oriucs."

OE BLACKFOOT, IDAHO.

rLAsrrc-nnocK Mom). 7

$pecification of Application filed November T0 all fIUIMT/Ilit may concern:

' Be it known that 1, Banner Jorriv'linnson'. a citlzen of the United ltates. and a resident of Blackfoot in the county of llinggham and State of Idaho, have inventedcertain new and useful Improvements in Plastir Bloc-l: Molds, ofwhich the following is a specific tion.

.Myinvention relates to molds for forming building blocks of a plastic material. and

the purpose of my invention is the provision of a mold whichis capable of forming a wlth ducts extending completely assembled to permit the removal of the block.

"I Wlll describe one form of mold embodying my invention and one form of block, and will then point out the novel features thereof in claims.

In theaccompanying drawings Figure 1 1s a viewshowmg 1n perspective one form of mold embodyingmy invention.

Figure 2 is a longitudinal sectional view of the mold shown in Figure 1.

Figure 3 is a tHtHSYGISQ- sectional view taken on the line 33 of Figure 2.

Figure at is a detail perspective view of. one of the duct forming members.

Figure 5 is a fragmentary vertical sectional view of one of the groove forming members showing the manner in which it is secured to the sides of the mold.

Figure 6 .is a fragmentary vertical sectional view taken on the-line 6-6 of Figure 5.

Figure 7 is a fragmentary view showing in side elevation the locking means for securing the front end of the mold in active position.

Figure 8 is a perspectiveview of the blocl-z formed by the mold,

Similar reference characters refer to similar parts in each of the several views.

Referring specifically to the drawings, the mold in its present embodiment is of rectangular formation and comprises a rear end wall B, side walls S and a front end wall F. The side Walls S are hingedly con:

Lett r -P n Patented Mar. '2, 1922.

1920. Serial No. 422,244..

nected to the rear end wall B by means of hinges 15 ,:as clearl shown iirFigure 1 so that they can s vine from the parallel spaced position outwardly to permit the ready removal of the molded block from the mold. Each side wall Q stantially co-extcnsivepin length vxitlfthe walls and are arranged at regular-spacer intervals from the bottom edges to "the top edges of the walls.- As clearly shown ,in Figures 8; andufi, each groove-forming member comprises a tube formedof any flexible material which will. not adhere to a plastic material. in the present i nstauce I employ rubbertubing; I. having found that carries a plurality of. groove-forn'ung members G which subrubber gives the requisite tlevibility while at the same time itcwill not adhere to any plastic materlal that is when the material 1s set. Each groove-forming memberG is secured in proper position onv and to the corresponding side wall Sbymeans of a rod lfixwhich. passes through the tube and has its opposite ends bent at right angles to provide extensions .16? which contact with the verticalledges of the side w; ll and are socured"theretoby meansof fastening;- members l'Z. As clearly shown in Figure 6, the confrontingedg s of the side walls 55*- are recessed at the proper points to receive the extensions 16 so that the latter will lieflush with. the surfaces of the edges thereby: permitting; the proper interfittingof the side walls with the end walls. As shown in liigure 5,.cach groove forming member reposcs within a groove 18 of arcuate con tourin cross sectionythe rod 16 embracing" the tubular member at this point so that it will be securely held in proper position within the mold.

.The front end member F carries a. pin rality of duct-forming members D which are arranged in a vertical series and in spaced parallel relation to each. other as clearly shown in Figures 2 and 3. Each duct-forming member D comprises a core 19 upon which is snugly fitted a tubular acket' 2G. The core 19 is of such a length that its free end contacts with the inner face of the rear end wall B when the front end wall F is in applied position. The jacket 20 is prefe ably formed of rubber or any other material which will not adhere to vthe plastiematerial introduced into the mold for forming the block. r

The front end wall F is securely held in applied position by means of hooks 21 pivotally mounted upon the side imembers S and engegeeble withkeepers 22 carried by the vertical er ges of the front end wall. A.

handle 28 is provided on the front end wall to facilitate the epplicetion and removal of the duct-forming members to and from the mold;

In the operation of themold, it is locked inthc form shown in Figure land when phiced upon e flat surface, e plastic meteriel is introduced to the upper side of the mold. When the mold has been completely filled with uplestic material and allowed to stand'ntimesufi icient to allow the settin ig of tliefmeterilil', a block such as that shown in Figure 8 1s formed- As here shown,- the bodyof the block is formed with a plurality oflongitudin elly extending'ducts 24: of circular form incrosssection. It will be understood, the ducts erefforme'd by the members D e-11dbeceusejof the length of'such members the ducts extend completely through the body" of the blocks; The

opposite sides of the block are formed with a plurality 'of longitudinally extending grooves 25, catch of which coextensive in length with theblock end has across sectional contour of ercuate form which is greater than a. semi-circle] This particular form of groove provides channels for the reception of mortar, and because of the fact that they ere greater thene semi-circle in crosssect-ionel contour, effects a locking of the mortar within the grooves thereby securely locking the mortar of one block with that of en edj scent block end thus securely retaining any two edjacentfbl'ocks together.

After Vtheblock has been properly set, the mold can be readily removed from the block by first disengaging the hooks 21 from the keeper 22 end then gripping the'hendle 23 and pulling the front end wall F outwardly from the mold. With this movement of the .front end well, 7 theseveral duct-forming bled laterally out of the grooves 25 of the block. This reeclyremoval of the grooveformmg members from, the grooves is accom formed of rubber will. not adhere to the surface of the block so that no disfigureinent of the same occurs during its removal.

With the, members D withdrawn from the block and the side wells swung 0utweirdly, itwillhe clear that-the mold can be disengaged from the blocln and reasseminother p'oi'ntfor the forming of a second block.

Although I have herein shown and described only one form of bloclr mold embodying my inventioinfit is to be understood that various changes and modifica- "is may be Inside herein without depart- Li from the spirit of the ii'lvention and the spirit and scope of the; appended claims;

'll het I claim is: V

l. A block mold comprising e reer'c nd well, side wells hingedly connected to the rear end well for outward swinging movement, grooveforining members secured to the confronting sides of the side walls and each comprising flexible tubular member,-'

a rod for securing the member in position upon the side well, a front end well detachebly secured to and spennlng the slde walls. and duct forming'members secured to the inner sides of-the front endwall, each 0 said duct forming members comprising a. core and a jacket embracing thecore.

2. A block mold comprising, a rear end well, side walls hingedly connected to the rear end wall for outward swinging'niove inent and having fronting; feces G ooves formed in the conthereof, groove forming members disposed within said grooves and comprising; tubular members formed of ruleber and rods extending through the members eppositeseid grooves and secured to the vertical edges of the side wells; 2. front 7 end wall detachably secured to the 3 side wells,- and duct-forming members secured to the front end wall end eechcomprising, a

core and e rubber jacket for the core.

ERNEST JOHN BENSON 

